From 4c1c3786efec2db95440f1e9e3ee60dc38aa9094 Mon Sep 17 00:00:00 2001
From: IgorA100 <igora100@gmail.com>
Date: Sat, 8 Jun 2024 23:55:22 +0300
Subject: [PATCH] Fix: If "opts.focal" - calculate coordinates taking into
 account the planned Scale, and not just the calculated Scale (panzoom.ts)

---
 src/panzoom.ts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/panzoom.ts b/src/panzoom.ts
index 51722106..8b323a0e 100644
--- a/src/panzoom.ts
+++ b/src/panzoom.ts
@@ -314,6 +314,7 @@ function Panzoom(
     if (!opts.force && opts.disableZoom) {
       return
     }
+    const toScalePlanned = toScale
     toScale = result.scale
     let toX = x
     let toY = y
@@ -323,8 +324,8 @@ function Panzoom(
       // plus the current translation after the scale
       // neutralized to no scale (as the transform scale will apply to the translation)
       const focal = opts.focal
-      toX = (focal.x / toScale - focal.x / scale + x * toScale) / toScale
-      toY = (focal.y / toScale - focal.y / scale + y * toScale) / toScale
+      toX = (focal.x / toScale - focal.x / scale + x * toScalePlanned) / toScalePlanned
+      toY = (focal.y / toScale - focal.y / scale + y * toScalePlanned) / toScalePlanned
     }
     const panResult = constrainXY(toX, toY, toScale, { relative: false, force: true })
     x = panResult.x